Condensed Matter Journal Club: Altermagnetism in correlated systems
- Event Type
- Seminar/Symposium
- Sponsor
- Condensed Matter Journal Club
- Location
- ESB 3110
- Date
- Feb 26, 2025 3:00 pm 10/09/2024
- Speaker
- Anzumaan Chakraborty (UIUC)
- Contact
- Amanda Gatto Lamas
- amandag6@illinois.edu
- Views
- 91
- Originating Calendar
- Physics - Condensed Matter Journal Club
Altermagnetism describes a broad class of magnetically ordered phases that display zero magnetization, time-reversal symmetry breaking, and nodal even-parity spin-splitting. In the first part of my talk, I will introduce piezomagnetism as a robust feature of altermagnets (AM), which promotes a magnetic field-tunable coupling between the order parameter and strain fields. When crystalline defects are present, the magnetic field interpolates non-monotonically between acoustic phonon-dominated and random strain-dominated regimes, resulting in a “distorted” random field Ising model (RFIM) phase diagram with magnetic field-tunable disorder. In the second part of my talk, I will show that metallic kagome-based materials can realize orbital altermagnetism, owing to the existence of van Hove singularities (vHs) in the kagome band structure. Such a state emerges from the interplay of two common instabilities associated with the vHs, namely, bond order and loop-current order. Using a low-energy microscopic tight-binding model, I will show that kagome-based materials can display orbital altermagnetism, ferromagnetism, or antiferromagnetism, depending on the charge-order configuration.